"Strange change in luminosity?"

Hearing Xiaoguang's description, Yang Meng suddenly thought of something:

"Xiao Yi, is it talking about Bright Star?"

"Possibly, the more massive the star, the more likely it is to become a flare!"

"Shine the stars......"

I still know a little about Yang Meng,

The so-called star is not a specific class of stars, but a very general concept.

A flare is a kind of star discovered by human beings in the universe, and the luminosity of the star changes drastically in a short period of time.

And these kinds of stars are very common in the universe.

But the reasons for this sudden change are different.

The main reason for the flares of most stars,

Or is it because the fusion reaction of the star is not so stable,

Nuclear fusion requires extreme pressure and extremely high temperatures.

This makes it impossible for a single star to fuse the entire star.

It's close to the core of the star, where the fusion reaction is most intense.

As a result, turbulent thermal convection occurs throughout the interior of the star.

As for the mixed-length theory of star convection, even human beings who have mastered controlled nuclear fusion still cannot fully grasp the multi-party model at the stellar level.

It is precisely because of the inconsistency of the internal and external reactions of the star,

Causes flares and sunspots in stars,

For example, the sun owned by human beings will have a certain photometric change every 11 years, which is the flare of the sun.

However, although the solar flare will affect the electromagnetic communication system on the earth from time to time, creating a brilliant and colorful aurora.

But in terms of the entire cosmic environment,

Such a change in luminosity can be regarded as a very stable star.

For example, Rutan 726-8, which is 8.73 light-years away from Earth, has experienced a 10-fold change in brightness in 3 minutes.

If that brightness is produced by a flare explosion, the destructive power is considerable, and such stars abound in the universe.

"But according to Xiaoguang, they also detected the situation of the Earth through a certain amount of flare?"

"In this way, that star is probably not an ordinary flare!"

The reason why Yang Meng thinks this way is because most of the materials ejected by stellar flares are streams of charged particles.

This gushing out of stellar material will interfere with various means of observation.

Not to mention that observing the solar system with the help of microgravitational lensing is a troublesome thing to avoid the interference of stellar winds.

Yang Meng confirmed the situation of the star to Xiaoguang again, and Xiaoguang's answer was still the same as the previous answer,

This can't help but make him ponder!

"Maybe the change in luminosity isn't caused by the flare?"

"There are many stars in the universe that have not yet found the cause of their flares?"

"But whatever it is, the 560-million-year-old pair of stars is too old!"

Thinking of this, Yang Meng shook his head silently, not dwelling on this issue,

What he knew about astrophysics told him that massive stars were very short-lived.

It's going to be very difficult to find a clue to that star, too

Hsu that star has exploded, leaving behind its own ashes - nebula matter

And the nebula matter is in the passage of time,

will also reunite into next few levels of stars,

Maybe the remnants of the unknown star are swaying around the solar system for dozens of light-years,

In short, hundreds of millions of years are too long,

Yang Meng retracted his thoughts and continued to ask Xiao Yi:

"Even microgravitational lensing plus direct visual vision can't make the Rutans see what Earth is like, right?

What technology did you use to see the Earth from technology that spanned so far? ”

For Yang Meng's question, Xiaoguang immediately answered:

"To be seen, not to be observed?"

"Seen?"

Thinking of the strange humanoid creatures I saw in the virtual world before,

and the costumes they wore from all ages,

For Xiaoguang's answer, Yang Meng thought of something, but he didn't dare to confirm it.

"We used string theory to analyze the light refracted by the gravitational lens, and analyzed the information left in it?"

"It's possible to do it this way!"

Hearing such an answer, Yang Meng was a little unable to keep calm,

Even Xiao Yi in his body was skeptical of Xiao Guang's answer.

When on Earth,

Some online communities that love astronomy often exchange a question,

Will the information scattered from the earth be seen by civilizations that are extremely far away from the earth?

Like the sun's rays reflected from the earth,

Moving at the speed of light in the universe,

If there is an advanced civilization 2,000 light-years away that can interpret the information transmitted by light,

So, is it possible that the civilization there will see what the Earth saw 2,000 years ago?

If you can see it,

Everything that happens on Earth will be a transparent existence to the entire universe.

However, this is not the case.

The carrier of information will be annihilated, and the transmission of light will be attenuated by the obstruction of various substances.

It's like turning on a flashlight on the Earth, and the light it emits can't be transmitted to the moon,

The sky looks very empty, and when there are no clouds, you can see the moon directly.

But the earth's atmosphere is densely packed with all kinds of gas molecules that cannot be seen by humans.

When light hits these elements, it is either absorbed or obscured and scattered.

In short, attenuation occurs after the light travels a certain distance,

Even after the light enters the universe, it is not unimpeded.

Although space is a "vacuum" environment, it is not a vacuum in the full sense of the word.

There are stars in the universe that emit streams of charged particles,

Some of the tiny particles in these streams of charged particles also carry mass,

As you get farther and farther away from the sun, the speed becomes slower and slower,

Eventually, in the direction of travel of the sun, it forms a shock layer of high-temperature particles like a transparent shield with the galactic space.

And when the light hits these things, there will also be attenuation.

If the rays leave the solar system,

The environment in the universe is more complex.

Massive celestial bodies have a gravitational distortion of light,

Dust matter will block the advance of light,

Various celestial bodies also block the presence of light,

In this case, the light of a star transmitted 2000 light-years, and the light produced by this star began to flicker.

Not to mention that a planet just reflects the sun's rays,

It is unknown how many of these reflected photons will eventually be transmitted to a distance of 2,000 kilowatt years.

The galaxy where Rutan is located was 560 million years ago, although it was closer to the west of the Sun.

It also has the gravitational lensing effect of massive stars, which gathers some of the light from the earth.

But it's still very difficult to see what the earth is like.

What's more, now, Rutan is now 12.36 light-years away from Earth,

There are also no other stars that act as gravitational lenses to observe the Earth......